<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<style>
   .da{
      width: 300px;
      height: 300px;
      border: 4px black solid;
  }
  .a,.b,.c{
      width: 200px;
      height: 60px;
  }
  .a{
      background: palevioletred;
  }
  .b{
      background: darkcyan;
      position: relative;
      top: 30px;
      left: 50px;
  }
  .c{
      background: chocolate;
  }
</style>

<body>
        <div class="da">
                <div class="a">1</div>
                <div class="b">2</div>
                <div class="c">3</div>
        </div>
</body>
</html>